/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.tinkerpop.gremlin.server.handler;

import io.netty.handler.codec.http.HttpMessage;

import static io.netty.handler.codec.http.HttpHeaderNames.UPGRADE;
import static io.netty.handler.codec.http.HttpHeaderNames.CONNECTION;

/**
 * A class to handle common WebSocket operations.
 *
 * @author Keith Lohnes lohnesk@gmail.com
 */
final class WebSocketHandlerUtil {

    static boolean isWebSocket(final HttpMessage msg) {
        final String connectionHeader = msg.headers().get(CONNECTION);
        final String upgradeHeader = msg.headers().get(UPGRADE);
        return (null != connectionHeader && connectionHeader.equalsIgnoreCase("Upgrade")) ||
               (null != upgradeHeader && upgradeHeader.equalsIgnoreCase("WebSocket"));
    }
}
